The general term for isomerism where the isomers concerned also share structural formulae

A form of the above where the difference comes from an inability of part of the species to rotate

A hard-to-detect form of isomerism which arises when a carbon atom has four different groups bonded to it.

Materials

Force divided by the initial area of a sample.

Extension divided by original length

The ratio of the two previous answers

Signals

A complex number describing the magnitude and phase of a sinusoidal signal

A circuit designed to eliminate components at one specific frequency from a signal

A component which changes its electrical properties in response to a change in its physical properties or environment

Semiconductors

A pure sample of a material with semiconducting properties, such as silicon

A sample of semiconducting material where the fermi level is closer to the valence band than for a pure sample of semiconducting material

An impurity added to semiconducting material in order to increase or decrease the number of free electrons within it.

Fluid mechanics

A dimensionless quantity which measures the turbulence of a fluid flow

An equation which defines the 'head' of a fluid flow as being the sum of terms in its pressure, velocity and height

The equation which states that the mass flow rate of a fluid flow must remain constant.

Nuclear physics

The difference between the mass of a nucleus and the total mass of its nucleons

A form of nuclear fusion which is catalysed by short-lived particles

A substance used to slow down the neutrons released as part of a nuclear fission reaction.

Particle physics

The antiparticle formed when a nucleus undergoes beta decay (I assumed beta -. but beta + decay is now accepted.))

Electrons, Muons, Tau particles, as well as their respective antiparticles and neutrinos, are all members of this group of fundamental particles.

A baryon composed of two up and one down quark

Analysis of chemicals

A technique which provides information as to how a molecule breaks up when ionised, and on the mass of various chemical species

A technique used to analyse chemical species which exploits the property of nuclear spin possessed by certain nuclei

The shining of various wavelengths of infrared radiation onto a sample to see which ones are absorbed

Acid/Base theory

The theory of acid-base interactions which considers an acid to be a proton donor

A substance with the ability to react as both an acid and a base

A theory of acid-base interactions where an acid is held to be a species which accepts electron pairs, and a base one which donates them.

Reaction Mechanisms

The reaction between bromoethane and hydroxide ions to produce bromide ions and ethanol is an example

A compound which attacks parts of other compounds which are rich in electrodensity.

An electrically-neutral 'fragment' which can form when something breaks a chemical bond - these fragments are highly reactive, and can attack even relatively stable compounds such as alkanes in a substitution reaction.